> -----Original Message----- > From: qemu-devel-bounces+ericj=mips....@nongnu.org [mailto:qemu-devel- > bounces+ericj=mips....@nongnu.org] On Behalf Of ??? (Wei-Ren Chen) > Sent: Thursday, November 15, 2012 1:03 AM > To: qemu-devel@nongnu.org > Cc: Jia Liu > Subject: [Qemu-devel] Question about comment on MIPS POOL32AXF encoding > > Hi all, > > I am reading POOL32AXF encoding in target-mips/translate.c, > and can't understand what the comment says. For example, > > /* bits 13..12 for 0x01 */ > MFHI_ACC = 0x0, > MFLO_ACC = 0x1, > MTHI_ACC = 0x2, > MTLO_ACC = 0x3, > > I compare this with microMIPS32 manual [1] Table 6.5, but I still > don't understand why they're encoded in such way. The comment says > "bits 13..12 for 0x01", I can roughly understand the enum list > bits 13..12 here, but what "for 0x01" exactly means?
Please refer to the following document. MIPS® Architecture for Programmers VolumeIV-e: The MIPS® DSP Application-Specific Extension to the microMIPS32™ Architecture http://www.mips.com/secure-download/index.dot?product_name=/auth/MD00764-2B-microMIPS32DSP-AFP-02.34.pdf -Eric
